Mathematics was previously seen as a plural, but this usage is obsolete.

"… Artificers, to whom the Practical Mathematics are of great and immediate Uſe." A System of Practical Mathematics - John Potter, 1753

"Mathematics are based on arithmatic[sic], algebra and geometry, and are either pure or mixed." - The teacher's assistant in the "Course of mathematics adapted to the method of instruction in the American colleges - Jeremiah Day, 1836

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